Continuity mistake: When Wynn is talking to Al about the mission to blow up the plant, Wynn puts his cigarette out in the ash tray in the scorpion bowl and there are 4 butts in the ash tray, but a minute later when the camera shows the 2 scorpions fighting, the ash tray has no cigarette butts in it.

Continuity mistake: When Spawn is fighting with the clown, who is in his big reptilian monster form, Spawn is thrown against a fence with pointed tops. He is impaled against them, but the ones right next to him are shaking as if they were made of rubber, not of metal. In the next shot, the spikes are stiff and solid and made of metal.

Continuity mistake: When Cyan is given the clown doll at her party, it spins around and spits (or breaths) the green stuff and stops, but immediately in the next shot, the head has made a 180 Degree spin, which is impossible in that time.

Factual error: In the scene where Priest fires at Spawn from the balcony, a magazine can be seen sticking out of the bottom of Spawn's P90. This reveals it is a fake P90 shell on an Ingram Model 10. The P90 has a clear magazine that sits on the top of the weapon.

Factual error: In scenes where Spawn has the ammo belts over his chest (at the banquet and also before getting on the motorcycle), the rounds are of some very high caliber weapon. However, the only gun(s) Spawn carries is a P-90 submachine gun, which uses magazine-fed 5.7mm ammo. What are the ammo belts for if he isn't carrying a weapon that can use them?

Revealing mistake: During the final battle in hell, when the army of Spawns rise up, there are some small errors to look for. First, during a few shots where the army is closer to camera, you can see the CGI army becoming "pixely." Also, you can see at least one of the Spawn floating in the air, not standing on the platform with the rest of him. Problems with the CGI rendering/animation.

Deliberate mistake: The legion of hellspawns during the film's climax are merely copied and pasted throughout the screen, as evidenced by the fact that many of them perform the exact same distinguishable body movements, such as pacing right and left from a crouched position.

Plot hole: Al Simmons' reasoning for wanting to quit A-6 is because he learns his rocket attack in his assassination mission in the beginning of the film yielded civilian casualties. This makes no sense, as he blatantly gunned down several innocent men in the air control tower just moments before.

At the dinner ceremony where Spawn attacks Wynn and kills Church, you can see a red-headed woman in a blue gown walking among the patrons in the beginning of the scene. The camera focuses on her briefly, but for a reason - look at her earrings. They are Spawn insignia. This is a reference to the angel Hellspawn hunter Angela, who wears those same insignia in the comics as trophies of her victories over previous Hellspawn. Very clever reference.